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A population of high-velocity absorption-line systems residing in the Local Group
Fechner, C.; Richter, P.; Bouma, S. J. D.
Aims: We investigated the ionisation conditions and distances of Galactic high-velocity clouds (HVCs) in the Galactic halo and beyond in the direction of the Local Group (LG) barycentre and anti-barycentre, by studying spectral data of 29 extragalactic background sources obtained with the Cosmic Origins Spectropgraph (COS) installed on the Hu…
An Hα Imaging Survey of All (Ultra)luminous Infrared Galaxies at Decl. ≥ -30° in the GOALS Sample
Wu, Hong; Cao, Chen; Jin, Jun-Jie +5 more
This paper presents the result of Hα imaging for luminous and ultraluminous infrared galaxies. It is a complete subsample of the Great Observatories All-sky LIRG Survey (GOALS) with decl. ≥ -30°, and consists of 148 galaxies with log(L IR/L ⊙) ≥ 11.0. All the Hα images were carried out using the 2.16 m telescope at the Xinglo…
Growth and disruption in the Lyra complex
Brunetti, G.; Rossetti, M.; Molendi, S. +16 more
Context. Nearby clusters of galaxies, z ≲ 0.1, are cosmic structures still under formation. Understanding the thermodynamic properties of merging clusters can provide crucial information on how they grow in the local universe.
Aims: A detailed study of the intra-cluster medium (ICM) properties of un-relaxed systems is essential to understand …
Chandra Detection of Intracluster X-Ray Sources in Fornax
Jin, Xiangyu; Li, Zhiyuan; Hou, Meicun +1 more
Based on archival Chandra observations with a total exposure of 1.3 Ms, we study X-ray point sources in the Fornax cluster of galaxies, with the primary aim of searching for intracluster X-ray source populations. We detect 1177 point sources out to a projected radius of ∼30 arcmin (∼180 kpc) from the cluster center and down to a limiting 0.5-8 keV…
The GALANTE photometric system
Lennon, D. J.; García-Lario, P.; Maíz Apellániz, J. +9 more
This paper describes the characterization of the GALANTE photometric system, a seven intermediate- and narrow-band filter system with a wavelength coverage from 3000 Å to 9000 Å. We describe the photometric system presenting the full sensitivity curve as a product of the filter sensitivity, CCD, telescope mirror, and atmospheric transmission curve…
Rovibrational Spectral Analysis of CO3 and C2O3: Potential Sources for O2 Observed in Comet 67P/Churyumov-Gerasimenko
Fortenberry, Ryan C.; Peters, Daniel; Ferrari, Brian C. +1 more
The recent ROSETTA mission to comet 67P/Churyumov-Gerasimenko detected surprisingly high levels of molecular oxygen (O2; hypervolatile species) in the coma. Current models predict that considerable levels of other hypervolatiles (such as molecular nitrogen, N2, methane, CH4, and Argon) should be found at similar le…
Secondary Radio and X-Ray Emissions from Galaxy Mergers
Murase, Kohta; Mészáros, Peter; Yuan, Chengchao
Shocks arising in galaxy mergers could accelerate cosmic-ray (CR) ions to TeV-PeV energies. While propagating in the intergalactic medium, these CRs can produce high-energy neutrinos, electron-positron pairs, and gamma-rays. In the presence of intergalactic magnetic fields, the secondary pairs will radiate observable emissions through synchrotron …
X-ray and optical observations of the black hole candidate MAXI J1828-249
Makishima, Kazuo; Ueda, Yoshihiro; Itoh, Ryosuke +8 more
We report results from X-ray and optical observations of the Galactic black hole candidate MAXI J1828-249 performed with Suzaku and the Kanata telescope around the X-ray flux peak in the 2013 outburst. The time-averaged X-ray spectrum covering 0.6-168 keV was approximately characterized by a strong multi-color disk blackbody component with an inne…
Combining high-contrast imaging and radial velocities to constrain the planetary architectures of nearby stars
Quanz, S. P.; Apai, D.; Ségransan, D. +3 more
Context. Nearby stars are prime targets for exoplanet searches and characterization using a variety of detection techniques. Combining constraints from the complementary detection methods of high-contrast imaging (HCI) and radial velocity (RV) can further constrain the planetary architectures of these systems because these methods place limits at …
Realization of a multifrequency celestial reference frame through a combination of normal equation systems
Nothnagel, A.; Karbon, M.
Context. We present a celestial reference frame (CRF) based on the combination of independent, multifrequency radio source position catalogs using nearly 40 years of very long baseline interferometry observations at the standard geodetic frequencies at SX band and about 15 years of observations at higher frequencies (K and XKa). The final catalog …